Can the details of the trademark owner be updated without transferring ownership of the trademark?

Yes, it's possible:

• Change of name: This happens when a company updates its name due to changes in its bylaws, like a new business name or entity type. The trademark ownership stays with the same entity, just under a new name.
• Change of address: The trademark owner updates their address.
• Change of attorney on file: The trademark owner appoints a new legal representative or attorney.